BodySite code not generated properly

[jenniferjiangkells]

Description

CdsDataGenerator should generate valid codes in FHIR resources.

Actual Result

bodySite not generating valid codes

                    "bodySite": [
                        {
                            "coding": [
                                {
                                    "system": "http://snomed.info/sct",
                                    "code": "6",
                                    "display": "d"
                                }
                            ]
                        }
                    ],